Just let your baby set the pace. If LO starts fussing a tiny bit, see if they will go back to sleep. If they continue to fuss, then pick him up and nurse him lying down (you can doze off during this half hour that he is feeding). Eventually he will be taking bigger meals at night as he gets older (he is only 8 wks!!) and you will get more sleep.
You can do this, hang in there In the meantime, try to take naps as much as possible during the day!